package com.sky.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @author Lenovo
 */
@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        log.info("加入购物车：{}", shoppingCartDTO);
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtil.copyProperties(shoppingCartDTO, shoppingCart);
        //获取用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //判断加入购物车的商品是否存在
        List<ShoppingCart> list = shoppingCartMapper.add(shoppingCart);
        if (CollUtil.isNotEmpty(list)) {
            //存在就让数量加一
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.update(cart);
        } else {
            //不存在就添加
            //判断是菜品还是套餐
            Long dishId = shoppingCart.getDishId();
            if (dishId != null) {
                //添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setDishFlavor(shoppingCartDTO.getDishFlavor());

            } else {
                //添加的是套餐
                SetmealVO setmealById = setmealMapper.getSetmealById(shoppingCart.getSetmealId());
                shoppingCart.setName(setmealById.getName());
                shoppingCart.setImage(setmealById.getImage());
                shoppingCart.setAmount(setmealById.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart
                .builder()
                .userId(userId)
                .build();
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteBatch(userId);
    }
    /**
     * 删除购物车中的一个商品
     *
     * @return
     */
    @Override
    public void deleteOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtil.copyProperties(shoppingCartDTO, shoppingCart);
        //获取用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //查询购物车
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (CollUtil.isNotEmpty(list)) {
            //判断购物车中是否有该商品
            ShoppingCart cart = list.get(0);
            if (cart.getNumber() > 1) {
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.update(cart);
            }else if (cart.getNumber() == 1) {
                shoppingCartMapper.deleteById(cart.getId());
            }
        }
    }
}
